appease vs expiate

appease

verb
  • To come to terms with; to adapt to the demands of. 

  • To make quiet; to calm; to reduce to a state of peace; to dispel (anger or hatred). 

expiate

verb
  • To atone or make reparation for. 

  • To wind up, bring to an end. 

  • To make amends or pay the penalty for. 

  • To purify with sacred rites. 

How often have the words appease and expiate occurred in a corpus of books? (source: Google Ngram Viewer )